<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script src="http://apps.bdimg.com/libs/angular.js/1.4.6/angular.min.js"></script>
	</head>
    <body>
    <div ng-app="myApp" ng-controller="myCtrl">
        <p>{{ x1 }}</p>
        <p>x1 is string?</p>
        <p> {{ x2 }}</p>
        <p>x1 is num?</p>
        <p> {{ x3 }}</p>
        <p>x1 uppercase?</p>
        <p> {{ x4 }}</p>
    </div>

    <script>
        var app = angular.module('myApp', []);
        app.controller('myCtrl', function($scope) {
            $scope.x1 = "hello world";
            $scope.x2 = angular.isString($scope.x1);
            $scope.x3 = angular.isNumber($scope.x1);
            $scope.x4 = angular.uppercase($scope.x1);
        });
    </script>

</body>
</html>
